Pneumatic sand-shaker.



No. 807,709. PATENTED DEC. 19, 1905.

A. H. BARBER. PNEUMATIC SAND SHAKER.

APPLICATION FILED DEO.4,1902.

2 SHEETS-SHEET 1 UNITED STATES PATENT OFFIQF.

ALBERT H. BARBER, OF WATERTOWN, NEW YORK, ASSIGNOR TO ELMER ELSVVORTHHANNA, OF CHICAGO, ILLINOIS.

PNEUMATIC SAN D-SHAKER.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application filed December 4, 1902. Serial No.133,864.

' tion.

This invention relates to that class of mechanisms which is adapted tobe used in connection with the screening of sand in foundries andsimilar places, and particularly to the construction and arrangement-ofparts, as will more fully hereinafter appear.

The principal object of the invention is to provide a simple,economical, and efficient pneumatic sand-shaker.

Further objects of the invention will apear from an examination of thedrawings and the following description and claims.

The invention consists principally in a pneumatic sand-shaker in whichthere are combined a spring-mounted riddle-holder for moving the partsin one direction and a fluidpressure cylinder provided with areciprocating piston projecting out of one end thereof separate from andresting against the screen-holder to operate the parts in the otherdirection.

The invention consists, further and finally, in the features,combinations, and details of construction hereinafter described andclaimed.

In the accompanying drawings, Figure l is a planview of a pneumaticsand-shaker constructed in accordance with these improvements looking atit from above; Fig. 2, a side elevation of the same; Fig. 3, an enlargedlongitudinal sectional view of the fluid-pressure cylinder and attachedparts shown separate from the riddle and holding mechanism in itsretracted position; Fig. 4., a similar view with the piston at itsextreme outer limit of movement Fig. 5, an enlarged cross-sectional viewtaken on line 5 of Fig. 3, and Fig. 6 an enlarged cross-sectional viewtaken on line 6 of Fig. 3 looking in the direction of the arrow.

In constructing a pneumatic sand-shaker in accordance with theseimprovements a split or clamping ring riddle-holder a is provided, inwhich a riddle 81 may be removably held. A clamping-screw c is used andpassed through outwardly-projecting lugs d on the riddle-holder, bymeans of which the holder is clamped to the riddle or releasedtherefrom. To yieldingly support the riddle-holder and at the same timeactuate it, as well as the other parts hereinafter set forth, in onedirection an inward onlytwo flat steel springs e are provided, rivetedto the riddleholders at their upper ends and to the standards f and g attheir lower ends. These standards are secured to a desired base portionh, which, as will be seen from an inspection of the drawings, acts tosupport all of the mechanism in position. To operate the parts in theother or outward direction, a fluid-pressure cylinder 11 is provided andsuitably secured to the supporting-base by means of braces j, as shownin Fig. 2. Reciprocatingly mounted in the cylinder is a piston k,projecting out of one end thereof, se arate from, but contacting theriddleho der at its extreme rounded outer end. The main end of thispiston is provided with a perforated shoulder Z, forming the pistonhead, the perforations m of which form a part of the passage-ways forthe inlet and exhaust of motive fluid to and from the rear of thepiston-head, as shown in Figs. 3 and 4..

To cut off and supply the motive fluid from and to the cylinder at therear of the pistonhead, the cylinder is provided with inlet and exhaustopenings n and p, and the piston is provided with a perforatedring-valve g, loosely and slidingly mounted thereon. The perforations 1"of this ring-valve act when the inlet-passage is open only as a part ofthe passage-ways for the inlet of motive fluid and never for the outletthereof. The rear end of the cylinder is preferably closed by means of aplug t.

In operation, assuming the parts to be in the position shown in Figs. 1,2, and 3, the motive fluid, as seen in Fig. 3, is entering through portn, passing through the perforationsr and m in the ring-valve andpistonhead, respectively, to the rear of such head. When sufficientmotive fluid has entered the space between the rear of the piston-headand the rear end of the cylinder, the piston is moved outwardly, movingwith it the riddle-holder and against the tension of its supportingspring mechanism until the ringvalve is moved to the position shown inFig. 4. At this position the inlet-passage n is closed and theexhaust-passage p opened, all

of which permits the motive fluid behind the piston-head to exhaustthrough passages m and 19, respectively, the potential energy of theriddleholdersupporting spring mechanism acting to return the parts tothe position shown in Fig. 3. These operations are continued over andover as long as motive fluid is supplied to the cylinder.

I claim 1. In a pneumatic sand-shaker, the combination of aspring-mounted riddle-holder for moving the parts in one direction, anda fluid-pressure cylinder provided with a reciprocating pistonprojecting out of one end thereof separate from and resting against thescreen-holder to operate the parts in the other direction, substantiallyas described.

2. In a pneumatic sand-shaker, the combination of a riddle-holder,spring mechanism upon Which it is yieldingly supported for moving it andother parts in one direction, a fluid-pressure cylinder, and areciprocating piston in such cylinder contacting the riddleholder andarranged to be moved and move the riddle-holder in one direction only bythe fluid under pressure and in the other direction by theriddle-supportin spring mechanism, substantially as described.

3. In a pneumatic sand-shaker, the combination of a riddle-holder,spring mechanism upon which such riddle-holder is yieldingly supportedand by which it is moved in one direction, a fluid-pressure cylinder, areciprocating piston in such cylinder extending out of one end thereofseparate from but ,C-Qntacting the riddle-holder to move it in thedireetiornopposite, to 7 the spring movements only and in turn tobe'moved in the opposite direction by the supportingspring.

mechanism of the riddle-holder, anda valve,

for such piston to cut OE and supply motive= fluid thereto to move suchpiston in one direction only, substantially as described.

4. In a pneumatic sand-shaker, the-combination of a riddle-holder,spring mechanism upon which it is supported and by which it is moved inan inward direction only, a fluid-pressure cylinder, a reciprocatingpiston separate from but contacting said holder to move it in an outwarddirection only and in turn be moved inwardly by the riddle-supportingspring mechanism, and a valve slidingly mounted in said piston to cutoff and supply motive fluid to said cylinder to operate the pistonoutwardly only, substantially as described.

5. In a pneumatic sand-shaker, the combination of a riddle-holder, afluid-pressure cylinder provided with inlet and exhaust openings, apiston projecting therefromto contact and operate the riddle-holder inone direction only provided with a perforated shoulder on its rear innerend, a longitudinally-perforated ring-valve slidingly mounted on thepiston to alternately open and close the exhaust and inlet openings toexhaust motive fluid from and admit it to the rear of the piston tooperate it in one direction only, and means for moving the riddleholderand thereby the piston in the 0 posite direction, substantially asdescribe 6. In a pneumatic sand-shaker, the combination of ariddleholder, a fluid-pressure cylinder provided with inlet and exhaustpassages, a reciprocating piston in such cylinder extending out of oneend thereof to move such riddle-holder in an outward direction only, aperforated shoulder secured to the rear inner end of the piston formingthe piston-head and a part of the passageways for the inlet and exhaustof motive fluid to and from the rear of the piston, a perforated ringvalve loosely and slidingly mounted on the piston between the head andbody portion to alternately open and close the exhaust and inletopenings and form a part of the passage-ways for the inlet of motivefluid to operate the piston in an outward direction only, and means formoving the riddle and thereby the piston in an inward direction only,substantially as described.

7. In a pneumat c sandshaker, the combination of a screen movablymounted, spring mechanism connected with such screen for moving it inone direction, a fluidpressure cylinder, and a piston mounted in suchcylinder movable by means of fluid under pressure in one direction onlyand in the opposite direction by means of the screenoperating springmechanism and operatively connected with the screen for moving it in theopposite direction to that in which it is movedxby means of the springmechanism.

8. In a pneumatic sand-shaker, the combination of a riddle-holder,spring-standards supporting the riddle-holder, a fluid-pressurecylinder, a piston in the cylinder contacting at its outer end with: theriddle-holder, and fluid-pressure means for moving the piston in anoutward direction only, the piston being returned by the pressure of thespringstandards.

ALBERT H. BARBER. Witnesses:

CHARLES BLAKE, BERT MILLER.-

